This is a TFAN-6080R12-4 60 x 80 mm Hard Glass Aluminum Flat Mirror with a thickness of 12mm, sourced from OptoSigma. The mirror is designed for use at a wavelength of 588nm and is made of BK7 glass from Schott.
The mirror features a metallic coating, specifically an opt Tfan Al Aoi 45 coating on the front surface. This coating enhances the mirror's reflectivity and durability, making it suitable for various applications.
The mirror's rectangular base shape, with dimensions of 60mm by 80mm, provides a large reflective surface area. The mirror is classified as a thin lens due to its thickness relative to its aperture.
The mirror's web links are valid and indicate that it is currently in stock. This information, along with the detailed specifications, should help you in your selection process for optical components with similar properties.